What do u think ? in bright sunlight...tourist streets...shooting at about 100 mm...would the bright light improve the af speed over good but only average light, ie. 5 min after sunset light ? ??

I'm not able to answer that. Here in Norway days are short now, and even in the middle of the day the light is more like late afternoon light during summer. These were the conditions I used the camera in, and answering your question would only be speculation. (But: Other contrast based autofocus systems I've used is generally faster in good light)